Abstract
To estimate the prevalence of computer vision syndrome (CVS) in presbyopic digital device workers using two ophthalmic progressive lens designs during the working day, and to analyse the association of CVS with sociodemographic, occupational, digital device exposure and refractive factors. This time series, quasi-experimental design study included 69 presbyopic digital device workers (age range: 46-69years; mean±SD=54.7±5.0). All used desktop computers at their workplace. Progressive addition lenses (PALs) and occupational lenses were used for three months each. CVS was measured with the CVS-Q© questionnaire before intervention (baseline) and at 1week, 1month and 3months after wearing the lenses. A multivariate logistic regression model was used to identify the factors that were associated with an improved CVS-Q© score. 37.7% of the subjects were female and 78.3% were ametropes; 65.2% had advanced presbyopia. 56.2% used digital devices at work >6hday-1 . The prevalence of CVS at baseline, after wearing PALs for three months and after three months of occupational lens wear was 68.1%, 33.3% and 18.8%, respectively. The mean CVS-Q© score was lower with occupational lenses than with PALs (p=0.001). 40.6% of the digital device workers improved their CVS-Q© score ≥2 points with the occupational lenses. Ametropes were less likely than emmetropes to improve with occupational lenses (OR=0.27, p=0.05). 89.8% of the sample workers were satisfied or very satisfied with the occupational lenses and 71% were similarly satisfied with the PALs. 73.9% chose the occupational lenses as their first choice of lens for digital device use, compared with 17.4% for PALs. Computer vision syndrome is reduced in presbyopic desktop computer workers wearing occupational lenses compared with PALs, especially in emmetropes.
Highlights
More than half of European workers use digital devices at work, and 37% use them more than 75% of the working day
In an attempt to overcome these limitations, the objective of this study is to estimate the prevalence of computer vision syndrome (CVS) in a sample of presbyopic workers who use digital devices using two ophthalmic progressive lens designs during the working day, and to analyse the association of CVS with sociodemographic, occupational, digital device exposure and refractive factors
The final sample was composed of 69 digital device workers (Table 1), with six losses to follow-up
Summary
More than half of European workers use digital devices at work, and 37% use them more than 75% of the working day. CVS symptoms may include eyestrain, headache and dryness, among others.[6,7,8] In the scientific literature, the prevalence of CVS in workers varies between 20%9 and 80%.10. This variability is attributed to the fact that the studies published so far evaluated CVS through unvalidated, unstructured questionnaires. These often include different symptoms as well as imprecise definitions when considering a worker to be symptomatic,[11,12,13,14,15] which compromise the findings. The prevalence depends on factors related to task demands, workplace conditions and the visual characteristics of the worker.[16,17] age, being female or wearing contact lenses can increase symptoms.[18,19,20,21]
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